Is it true that Uber no longer deactivates drivers for having low ratings?

There is a different standard in every city.  In markets where Uber is struggling to meet the driver count they will ease up on the rating requirements.  That's why 4.60 is just a guideline.

So if Uber is doing bad in your city, sure, I bet they don't deactivate you for doing anything.

You might be talking about the California decision when they were arguing over whether drivers are employees or independent contractor.  As a result of that, at least in the state of CA, Uber cannot deactivate drivers without proper notices and a reasonable time to remedy and improve the situation.  Specific reasons must be given and outlined and they can no longer be vague about it either.

So...is that what you are referring to?

I am not sure abotu that, but Uber monitors three driver metrics with high importance:

Driver Star Ratings - Known fo deactivate the users if it's ower than 4.60 or so.  I believe the threshold isn't a hard number.  Probably depends on the market.

Acceptance Rate - This is how often you actually accept the request that comes to your app.  If it's too low, Uber will send you a nastigram.  I am not sure how low you can go before you get deactivated though.

Cancellation Rate - This in my mind should carry a heavier penalty, and I know Uber does indeed deactivate driers for that.  Perhaps it's all in combination.